Seaquel
SQL Server error code

SQL Server error 9519

SQL Server raises error 9519 at severity 16, which marks a problem with the query or data that you can correct.

XQuery: The name supplied to sql:variable('%.*ls') is not a valid SQL variable name. Variable names must start with the '@' symbol followed by at least one character.
Msg9519
Severity16
Group9000–9999

Source: Database Engine events and errors